linux-kernel - Re: [PATCH 04/19] ARM64 / ACPI: Introduce arch_fix_phys_package

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Date:	Fri, 25 Jul 2014 18:32:14 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Mark Brown <broonie@...nel.org>
CC:	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <mark.rutland@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Will Deacon <will.deacon@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles.Garcia-Tobin@....com, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-acpi-private@...aro.org
Subject: Re: [PATCH 04/19] ARM64 / ACPI: Introduce arch_fix_phys_package_id()
 for cpu topology

On 2014-7-24 22:43, Mark Brown wrote:
> On Thu, Jul 24, 2014 at 09:00:10PM +0800, Hanjun Guo wrote:
> 
>> +/*
>> + * Use the CPU slot number provided by ACPI to update the physical
>> + * package id when cpuid_topo->cluster_id is not available, then we
>> + * can get the right value in the "physical id" field of /proc/cpuinfo.
>> + */
>> +void arch_fix_phys_package_id(int num, u32 slot)
>> +{
>> +	struct cpu_topology *cpuid_topo = &cpu_topology[num];
>> +
>> +	if (cpuid_topo->cluster_id == -1)
>> +		cpuid_topo->cluster_id = slot;
>> +}
>> +EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
> 
> As I said on the previous version of this patch are you sure this runs
> at a point between the cluster ID getting initialized to -1 and the slot
> being initialized (bear in mind that we now use MPIDR information if
> availabe).  I don't understand why we don't just unconditionally use the
> value given.

Ah, sorry, it should be unconditionally used as you said, and I remember
the comments in last version, but the patch shows not, must be something
wrong, will update it in next version.

Thanks
Hanjun

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